Dressing devices



Nov. 24, 1959 K. SOMMER msssmc DEVICES 2 Sheets-Sheet 1 Filed Aug. 21,1958 KURT SOMMER K. SOMMER DRESSING DEVICES Nov. 24, 1959 2 Sheets-Sheet'2 Filed Aug. 21, 1958 INVENTOR. KURT SoMMER BEE United States PatentDRESSING DEVICES Kurt Summer, Chicago, lll.,- assignor to Sbmmer & MacaI(l;ll ass Machiuery Co., Chicago, 111., a corporation of inoisApplication August 21, 1958, Serial No. 75 ,410 i Claims. c1. 12s 11This invention relates to dressing devices and, more particularly, todevices for dressing multiplegroove abrading wheels of the kind utilizedin glass manufacturing and in other industries. This application is acontinuation in part of application Serial No. 607,064, filed August 30,1956, now abandoned.

In the manufacture of panes of glass, and in other similar applications,it is frequently necessary to perform a finishing operation upon theedges of the panes in order to afford a completely finished product.Multiple-groove abrading or polishing wheels are frequently used forthis purpose, particularly where relatively high output volume isrequired. The abrading wheels may be employed to provide edges ofrounded, substantially semi-circular cross sectional configuration; inother instances, they maybe used to finish the panes with flat edgesbevelled at the corners to avoid sharp projections. The shape of thefinished pane edges, in either instance, is determined by thecross-sectional contour of the grooves in the abrading wheel.

Ordinarily, in finishing the edges of panes of glass or the like, thepanes are fed on edge through a plurality of grinding and abrading orpolishing stations. At each station, the edges of the panes are engagedin the grooves of an abrading Wheel. The abrading wheels are customarilyrotated in a direction such that the wheel surface engaged by the panemoves in opposition to the direction of movement of the pane.

In order to achieve the desired edge configuration in the finishedproduct, it is essential to maintain the abrading wheel grooves withinrelatively close tolerances as regards cross-sectional configuration.Consequently, it is necessary to dress the grooves at relativelyfrequent inter-. vals to retain the desired configuration, particularlyin the finishing of glass and other hard materials. Dressing the groovesof the polishing wheels has heretofore most frequently been performed byhand, a workman using a hand tool to dress each groove individually.This hand dressing technique is, at best, a slow and tedious procedurewhich requires an inordinate amount of time, especially when carried outon multiple-groove wheels having relatively large numbers of grooves, asare common in industry today. Moreover, it is difficult to achieve thedesired uniformity of grooves in a hand dressing operation, since thegroove contour is dependent to at "least some extent upon the skill ofthe workman.

Different devices and apparatus have been proposed in the past forperforming the necessary dressing operations upon multiple-grooveabrading wheels. For example, one such previously known device comprisesan. array of pencil-like dressing tools mounted in alignment with thegrooves of an abrading wheel in conjunction with the abrading station atwhich the wheel is mounted. The dressing tools, as they become wornthrough use, are rotated and advanced toward the abrading wheel in orderto preserve an evenly rounded configuration in theportion of each toolthat contacts the abrading wheel. Because only a small contactsurface isaffordedby-each' tool; his

. age of the glass.

not possible to use a device of this nature for dressing grooves ofother than rounded configuration. Moreover, the eifective contour of thetools may change, with use, if the tools are not rotated evenly as theyare advanced, or if the side portions of the tools become worn, as mayoccur in the case of relatively deep grooves.

Other previously known dressing arrangements have provided for thesimultaneous dressing of multiple grooved wheels where the grooves areof other than consistent rounded contour. These devices, however, haveconstituted complete independent dressing machines and have requiredthat the abrading wheel being dressed be removed from its normaloperating station and installed in the dressing machine. This is arelatively costly and time-consuming procedure, particularly with thelarge and heavy abrading wheels commonly employed in the finishing ofpanes of glass. Moreover, even such independent dressing machines havefrequently failed to afford adequate provisions to prevent changes inefiective contour of the dressing tools with continued use.

7 Another costly and diflicult problem encountered in this field relatesto the face portion, rather than the grooves, of the abrading wheel. Ascontinued dressing operations are carried out with respect to thegrooves of a wheel, the grooves become deeper. Eventually, the groovesare so deep that they contact a substantial portion of the flat surfacesof the panes. As a result, undesirable ridges may be formed in theperipheral portions of those surfaces; in other instances, misalignmentof the glass withrespect to the abrading wheel may cause break- It isthus necessary to dress the face portion of the wheel, periodically, tomaintain the depth of the grooves within practical Working limits. Thisface dressing operation has been, in many respects, even more diflicultand costly than the groove dressing procedure. No effective apparatushas been available, however, for performing the face dressing operationwhile the wheel is mounted in its abrading station, on other than ahandwork basis.

A primary object of the invention, therefore, is to eliminate individualhand dressing of a multiple groove abrading wheel and to provide a newand improved dressing device effective to carry out a complete dressingoperation while the abrading wheel remains mounted in its usual abradingstation.

Another object of the invention is to provide a new and improveddressing device capable of dressing both the grooves and the face of amultiple-groove abrading or polishing wheel more quickly, efiiciently,and economically than is possible with hand methods or previously knowndevices.

A further object of the invention is the provision of a new and improveddressing device for a multiple-groove abrading wheel which rapidly andsimultaneously dresses all of the wheel grooves to a uniform depth andconfiguration without requriing stopping of the wheel and withoutrequiring. individual guaging of the grooves.

An additional object of the invention is to provide a new and. improveddressing device for a multiple-groove. polishing or abrading wheel whichmay be used in conjunction with any desired groove contour and in whichthe groove contour may be conveniently and effectively changed for oneor more of the grooves without requiring replacement of the dressingtools: fior other grooves.

A specific object of the invention is to afford a new and improvedmultiple-groove dressing device which may be used for a protractedseries of dressing operations with respect to both the gnooves and faceof an abrading wheel without requiring more than minor adjustment.

Another object of the invention is the. provision of a new and improveddressing device for a multiple-groove abrading or polishing wheel whichincludes no complex tool advancing or actuating apparatus yet whicheffectively and conveniently compensates for wear of the dressing tools.

Other and further objects of the present invention will be apparent fromthe following description and claims and are illustrated in theaccompanying drawings which, by way of illustration, show a preferredembodiment of the present invention and the principles thereof and whatis now considered to be the best mode for applying those principles.Other embodiments of the invention embodying the same or equivalentprinciples may be used and structural changes may be made as desired bythose skilled in the art without departing from the present invention.

In the drawings:

Fig. 1 is a plan view of a dressing device constructed in accordancewith a preferred embodiment of the invention, and shows a fragmentaryportion of a glass work ing machine in which the dressing device may beemployed;

Fig. 2 is a front elevation view of the dressing device of Fig. 1, aportion of the device being cut away to illusstrate certain structuraldetails;

Fig. 3 is a side elevation view of the dressing device of Fig. 1, drawnto a larger scale;

Fig. 4 is a detail sectional view, taken approximately along line 44 inFig. 1;

Fig. 5 is a perspective view, taken from the bottom, of the dressingdevice of Fig. 1;

Fig. 6 is a side elevation view of the dressing device showing thedevice mounted in operative position on an abrading or polishingmachine;

Fig. 7 is a detail sectional view of a pane of glass engaging anabrading wheel;

Fig. 8 is a detail sectional view of a groove dressing tool usable inthe device of Fig. 1;

Fig. 9 is a detail sectional view of another groove dress-.

ing tool usable in the device of Fig. l; and

Fig. 10 is a detail view, partly in cross section, of the face dressingtool of the device.

The dressing device 20 illustrated in Figs. 1 through 6, which comprisesa preferred embodiment of the invention, includes a cross bar 22 mountedbetween two brackets 24 and 25. The cross bar 22 is preferablyrectangular in cross sectional configuration, as indicated in Figs. 4and 5, and may be afiixed to the two brackets by any suitable means suchas the two sets of bolts 26 and 27 which extend through the brackets 24and 25, respectively, and are threaded into opposite ends of the crossbar.

The cross bar 22 is provided with a plurality of elongated spaced slotsor openings 28 which are located at the lower left hand edge of the baras seen in Fig. 4. The closed ends of the slots 28 need not be square,but may be rounded as indicated by reference numeral 28A in Fig. 1.Within the slots 28 there are mounted a correspending plurality ofdressing tool-s 29. Each of the tools 29 is a substantially rectangularblock, preferably mild steel, having a relatively long lower edge 31which constitutes the working edge of the tool. Any suitable abrasivematerial may be used in the grinding edges 31 of the tools 29; a highlysatisfactory tool may be formed by using a mild steel block impregnatedto a depth of one-eighth inch with diamond dust, preferably of the orderof 40- grit in size. The contour of the cutting edge 31, of each toolmay be of rounded configuration, as indicated in. Figs. 2 and 5;substantially different tool contours may be used, however, as explainedin detail hereinafter. Each of the tools 29 is preferably provided witha pair of threaded openings in the upper edge portion thereof. As bestshown in Fig. 4, a pair of screws 32 extend through. correspondingapertures in the cross bar 22 and arethreaded into the tool openings toafford a convenient and effective means for mountnig the tools in fixedpositions within the recesses 28 in the cross bar.

A lead screw 33 is journalled in the two brackets 24 4 parallel spacedrelation to the cross bar 22. One end 34 of the lead screw extendsbeyond the bracket 25 and carries a hand wheel 35 (Figs. 1 and 2) whichis utilized in operating the lead screw, as described more fullyhereinafter. If desired, a simple handle 35A may be substituted for thehand wheel 35 (see Fig. 5).

A guide bar 36 is also mounted between the two brackets 24 and 25 and isdisposed in substantially parallel spaced relation to the lead screw 33,being located on the opposite side of the lead screw from the cross bar22. The guide bar 36 may be secured to the brackets by any suitablemeans such as the screws 38 and 39 which extend through the brackets 24and 25, respectively, and are threaded into suitable openings in theopposite ends of the guide bar. The guide bar, which preferablycomprises a rectangular steel bar, preferably is not mounted with any ofits sides facing the lead screw. Rather, one corner or edge portion 41of the guide bar is located in facing relation to the lead screw toafford a convenient and effective horizontal guide for a face dressingtoolholder 42.

The toolholder 42, in the illustrated embodiment of the invention,comprises a substantially rectangular steel block 43 having a threadedopening through which the lead screw 33 extends. One face 45 of thetoolholder block 43 is provided with a substantially V-shaped slot whichreceives the edge portion 41 of the guide bar 36. The opposite face 46of the block 43 engages one face of the cross bar 22. Thus, thetoolholder block 43 is maintainedin accurate alignment with the crossbar 22 by means of its engagement with the cross bar and with the guidebar 36. This is particularly important because the toolholder 42 ismoved transversely of the dressing device 20 in the course of a facedressing operation, as described in detail here and after.

The toolholder block 43 is provided with a pair of apertures 47 and 48,which extend downwardly through the toolholder block. Each of the twoapertures is inclined at a small angle from the vertical, the directionof inclination being opposite for the two apertures. The toolholderblock is also provided with a pair of horizontal apertures 51 and 52which are aligned with and intersect the apertures 47 and 48respectively. As best indicated in Fig. 4, a face dressing tool 53 maybe mounted in one of the toolholder apertures, in this instance theaperture 47, and is retained in fixed position therein by means of a setscrew 55 which is threaded into the horizontal opening 51. In theillustrated apparatus the dressing tool 5'3 is of substantiallypencil-like configuration and is provided with a diamond tip 56 at thelower extremity thereof.

It may be desirable to afford additional means for positively preventingrotation of the guide bar 36. In the dressing device 20 this additionalmeans comprises a pair of bosses 58 and 59 which are rigidly mountedupon and extend inwardly of the two brackets 24 and 25, respectively. Apair of set screws 62 and 63 are threaded into suitable openings in thebosses 58 and 59 respectively. The set screw 62 engages a fiat 64 at theend of the guide bar 36 adjacent the bracket 24. Similarly, the setscrew 63 is engaged in a second depression or fiat 65 at the oppositeend of the guide bar. The two set screws 62 and 63 afford an effectiveand positive means for preventing any rotational movement of the guidebar 36 and thus assure accurate alignment of the guide bar with thecross bar 22.

As best indicated in Figs. 3 and 5, the bracket 24 is provided with afirst elongated mounting aperture 66 at the end of the bracket adjacentthe guide bar 36. The bracket 24 is also provided with a secondelongated mounting slot 67 in the end thereof adjacent the cross bar 22.

In the illustrated arrangement, the slot 66 is shown as closed at bothends, whereas one end of the slot 67 is open; this construction is notcritical, however, and it is possible to use a pair of open ended slotsor a pair of closed slots if desired. Similarly, the bracket 25 isprovided with an elongated closed slot 68 adjacent the guide bar 36 andan open ended slot 69 at the end-of .theabracket nearest the cross bar22. i

The dressing device 20 is particularly advantageous in dressing thegrooves of abrading. or polishing wheels of the kind employed infinishing the edges of panes of glass, or the like, as pointed outhereinabove. Moreover, the device is eifective to carry out a dressingoperation without removing an abrading wheel from its normal operatingposition. The dressing device 20 may, for example, be employed in anabrading machine of the kind described in United States Patent Number2,796,707 to Meter, issued June 25, 1957. The mounting of the dressingdevice 20 on an abrading machine of this kind is illustrated in Fig. 6.

Only one abrading station of the machine 71 is shown.

As shown in Fig. 6, the abrading machine 71 may include an elongatedconveyor 72 and a table 73. A plurality of glass plates are moved alongthe table 73 by pushers which are connected by chains that move alongthe upper edge portion of oppositely disposed guide rails such as theguide rails 74 and 75, Figs. 2, 4 and 6. The conveyor arrangement isdisclosed in substantial detail in the aforementioned patent to Meter.The abrading machine, in accordance with conventional practice, may havea plurality of grooved abrading or polishing wheels made of suitablematerial, such as aluminum oxide, the wheel being suitably mountedclosely adjacent the conveyor. As the panes of glass move along theconveyor, the edge of each pane moves successively through one groove ofeach of the abrading wheels. In this manner, after the panes of glasshave traveled the full length of the conveyor, the edge portion of eachpane is ground and polished as the result of a series of abrading andpolishing steps.

One such grooved abrading wheel 76 is shown in the drawings. The wheel76 is provided with a plurality of grooves 77 on the periphery thereof.The wheel 76 is mounted (see Fig. 6) in a housing 78 on the conveyor 72.The wheel is disposed immediately below an opening in the table 73 ofthe conveyor; the mounting should be such that the wheel 76 may beraised from the lower or inactive position shown in Fig. 6 into an upperoperating position. A portion of the abrading wheel extends through thetable opening to engage the panes of glass moving along the table 73. Ifit is assumed that the glass moves from left to right along the conveyor72, the wheel 76 is rotated in a counterclockwise direction as viewed inFig. 6.

It will be appreciated by those skilled in art that any suitable meansfor adjusting the vertical position of the wheel 76 may be used. Forexample, the mounting mechanism shown and described in theaforementioned Meter patent may be employed. In Fig. 6, the illustratedadjusting mechanism comprises a feed screw 78 which is utilized to raiseand lower one end of an adjusting frame 79 in relation to the mainframes 74 and 75 of the conveyor. The pivot point for the frame 79 isindicated by the reference numeral 81. The shaft 80 of the abradingwheel 76 is journalled in a suitable hearing, such as the bearing 82, onthe frame 79.

In order to afford a convenient and elfective means for mounting thedressing device 20 upon the conveyor 72 of the glass finishing machine,a pair of slots 84 and 85 are formed in the opposite ends of the crossbar 22 immediately adjacent the brackets 24 and 25, respectively. Asimilar pair of slots 86 and 87 are formed in the opposite ends of theguide bar 36. Preferably the upper surface of each of the slots 84-87 isaligned with the lower surfaces of the two bosses 52 and 59. It is thusseen that the slots and the bosses, together with the brackets 24 and25, effectively afford a pair of elongated receptacles for receiving thetwo rails 74 and 75, as perhaps best shown in Fig. 2.

For reasons pointed out more fully hereinafter, it is highly desirablethat the dressing device 20 be easily and conveniently mounted upon orremoved from the rails 74 and 75, as the case may be. Moreover, it isequally important that convenient and eifective means he provided formaking minor adjustments in the position of the dressing device alongthe rails 74 and 75. Consequently, the brackets 24 and 25 are notpermanently aflixed to the rails. Rather, the brackets are secured tothe rails 74 and 75 by suitable bolts 84 and 85 which extend through theslots in the two brackets and are threaded into suitable tapped openingsin the rails 74 and 75 respectively. Thus, as best illustrated in Fig.6, the bracket 24 may be adjusted longitudinally of the rail 74 simplyby loosening the two bolts 84, permitting the bracket to slide relativeto the bolts. A similar arrangement is employed on the opposite side ofthe abrading machine 71. Moreover, it is a simple matter to remove thefour bolts 84, 85, thereby permitting convenient and effective removalof the entire dressing device 20 from the abrading machine. When thedressing device is in use, of course, the bolts 84 and 85 are tightenedto hold the dressing device in fixed position upon the rails 74 and 75.

When the abrading machine 71 is placed in operation, the grooves 77 ofthe abrading wheel 76 each engage the edge portion 86 of a pane of glass87 in the manner illustrated in Fig. 7. As the glass pane.87 engages theabrading wheel, the corners 86 are worn away; after passing through anumber of abrading stations, a smooth rounded edge contour is developedalong the entire length of the glass pane. With successive operations,however, the glass tends to wear away the abrading-wheel 76 and tochange the contour of the grooves 77 as indicated by dash lines 38. Thisprogressive wearing action on the abrading wheel, of course, reduces theeffectiveness of the abrading station and eventually making dressing ofthe abrading wheel essential.

To carry out a dressing operation; the conveyor chains (not shown) arelifted and the dressing device 20 is mounted upon the rails 74 and 75 ofthe abrading machine 71 in the manner illustrated in Fig. 6. Before thisis accomplished, it is first desirable to lower the wheel 76 so that itdoes not interfere with the mounting of the dressing device. Thereafter,the dressing wheel is elevated to bring its grooves 77 into engagementwith the individual groove dressing tools 29 of the dressing device, asillustrated in Fig. 8. The abrading wheel 76 is rotated, and as itrotates the grooves 77 are dressed .and are again brought intoconformity with the desired crosssectional configuration. where adifferent groove is desired, somewhat different dressing tools such asthe dressing tool 89 shown in Fig. 9 may be employed, the contour of thedressed groove being determined by the contour of the ressing tool.

The first time the dressing device 20 is employed to carry out'adressing operation, the device may be aligned with the wheel 76 as shownin Fig. 4, with the leading edges 91 of the dressing tools 29 in contactwith the wheel and engaging the base portions grooves 77. With continueduse of the dressing device, however, the dressing tool 29 may becomeworn. As this occurs, the dressing device is moved more and more to theleft, as seen in Fig. 4, in order that successive portions of the tooledges 31 may be utilized in subsequent dressing operations. In thismanner, a relatively large number of groove dressing operations may becarried out with a single set of tools 29 without requiring replacementof the dressing tools. Furthermore, by this progressive adjustingtechnique the effective contour of each dressing tool is maintainedconstant through a large number of dressing operations. Of course, thiscan only be accomplished when the dressing tools 29 are provided withrelatively long tool edges 31.

With continued use of the abrading wheel 76 the grooves 77 become deeperand deeper. The grooves are worn away by the glass panes, such as thepanes 87 and are of course further deepened by the dressing operationscarried out by means of the device 20'. Eventually,-the= Of course, inthose instances '7 grooves become undesirably deep and a dressing operation on the face of the abrading wheel is required.

Face dressing of the abrading wheel 76 is effected by the dressingdevice 20 in extremely simple and convenient manner and may be carriedout simultaneously with a groove dressing operation. For face dressingof the wheel 76, the tool 53 is adjusted, in its position within theblock 43, until it is in contact with the surface 91 of the abradingwheel. In fact, the tool 53 is adjusted to take a relatively smallcutting bite from the abrading wheel. The tool is then locked inposition by means of the set screw 55. After adjustment of the tool 53,the face dressing operation is accomplished simply by rotating theoperating handle 35, or 35A as the case may be, to advance thetoolholder 42 across the gap between the two brackets 24 and 25. In thismanner, the dressing tool 53, and particularly the cutting portion 56thereof, is effective to grind the face of the abrading wheel to a newsurface level as indicated by reference numeral 92 in Fig-10. Usually,it is preferable to traverse the toolholder 42 across the wheel 76 atleast twice in the course of a face dressing operation. Moreover, if arelatively large reduction in the diameter of the wheel 76 is required,it may be necessary to'readjust the dressing tool 53 for a seconddressing traverse in order to complete the operation.

In some abrading machines, it may be necessary to reorient the dressingdevice to overcome minor difiiculties which may be presented in thearrangement illustrated in the drawings. For example, if excess to theabrading machine cannot be obtained from one side, or if the directionof rotation of the abrading wheel is opposite that of the wheel 76, itmay be desirable to reverse the relative locations left to right, of thedressing tools 29 and the face dressing tool 53 with regard to theabrading wheel 76. On the other hand, in some instances it may bedesirable to orient the dressing tool 53 at a different angle withrespect to the abrading wheel, as by mounting the face dressing tool inthe aperture 48 of the block 43 rather than in the aperture 47 as shown.Of course, in a given application it may be desirable to use either therounded dressing tools 29, or angled faced tools such as the tool 89, orsome other desired configuration. Moreover, the tools mounted in thedevice 20 at any given time may differ among themselves if differentlycontoured grooves are required in a single abrading wheel.

The dressing device 20 completely eliminates hand dressing of themultiple grooved abrading wheel 76, yet provides for a complete dressingoperation without removing the abrading wheel from its normal operatingposition. Consequently, substantial savings in time, in labor and inloss of machine operation are effected. The wheel may be dressedcompletely without requiring braking of the wheel; moreover, individualguaging of the grooves is completely unnecessary. The elongated dressingtools 29 provide for a protracted series of dressing operations withoutrequiring any adjustment other than minor movement of the dressingdevice longitudinally of the rails 74 and 75. In this regard, it shouldbe noted that no complex tool advancing or adjusting apparatus isrequired, yet the dressing device 20 effectively compensates for wear ofthe dressing tools. Moreover, the construction of the dressing device 20is such that the face dressing tool 53 and its toolholder 42 are alwaysmaintained in accurate alignment with the dressing tools 29 and theabrading wheel 7 6.

Hence, while the preferred embodiment of the invention has beenillustrated and described, it is to be understood that this is capableof'variation and modification.

Iclaim: I

l. In an abrading machine of the kind embodying a rotatable groovedabrading wheel supported in a frame including parallel side railsdisposed on opposite sides of the machine, a dressing device comprising:an elongated substantial linear support bar having a plurality oftool-receiving recesses of given configuration in one face thereof, saidrecesses extending transversely of the bar in" parallel spaced relationto each other; a plurality of dressing tools each having a mountingportion complementary to the configuration of said recesses and anelongated linear abrading portion complementary in cross sectionalconfiguration to the cross sectional configuration of said abradingwheel grooves; means for removably mounting said dressing tools in fixedpositions within said support bar recesses with the abrading portions ofsaid tools projecting from said bar in parallel spaced alignment wtiheach other; mounting means on said support bar for engaging said siderails to mount said bar on said abrading machine within a predeterminedrange of operating positions along said side rails and with theelongated abrading portions of said tools disposed in tangentialengagement with respective ones of said abrading wheel grooves; andadjustable retaining means for maintaining said support bar at any of amultiplicity of different positions within said range to vary the pointsof contact between said dressing tools and said abrading wheel groovesand thereby compensate for wear on said dressing tools at incrementalpoints therealong.

2. In an abrading machine of the kind embodying a rotatable groovedabrading wheel supported in a frame including parallel side railsdisposed on opposite sides of the machine, a dressing device comprising:an elongated substantial linear support bar having a plurality ofsubstantially rectangular tool-receiving recesses in one face thereof,said recesses extending transversely of the bar in parallel spacedrelation to each other; a plurality of dressing tools each having asubstantially rectangular mounting portion and an elongated linearabrading portion complementary in cross sectional configuration to thecross sectional configuration of said abrading wheel grooves; means forremovably mounting said dressing tools in fixed positions within saidsupport bar recesses with the abrading portions of said tools projectingfrom said bar in parallel spaced alignment with each other; mountingmeans on said support bar for engaging said side rails to mount said baron said abrading machine within a predetermined range of operatingpositions along said side rails and with the elongated abrading portionsof said tools disposed in tangential engagement with respective ones ofsaid abrading wheel grooves; and adjustable retaining means formaintaining said support bar at any of a multiplicity of differentpositions within said range to vary the points of contact between saiddressing tools and said abrading wheel grooves and thereby compensatefor wear on said dressing tools at incremental points therealong.

3. In an abrading machine of the kind embodying a rotatable groovedabrading wheel supported in a frame including parallel side railsdisposed on opposite sides of the machine, a dressing device comprising:an elongated substantial linear support bar having a plurality oftool-receiving recesses of given configuration in one face thereof, saidrecesses extending transversely of the bar in parallel spaced relationto each other; a plurality of dressing tools each having a mountingportion complementary to the configuration of said recesses and anelongated linear abrading portion complementary in cross sectionalconfiguration to the cross sectional configuration of said abradingwheel grooves; means for removably mounting said dressing tools in fixedpositions within said support bar recesses with the abrading portions ofsaid tools projecting from said bar in parallel spaced alignment witheach other; mounting means on said support bar for engaging said siderails to mount said bar on said abrading machine within a predeterminedrange of operating positions along said side rails and with theelongated abrading portions of said tools disposed in tangentialengagement with respective ones of said abrading wheel grooves, saidmeans comprising a pair of shoulder elements projecting from theopposite ends of said bar and a pair of mounting brackets aflixed tosaid shoulder elements to define two mounting recesses for receivingsaid abrading machine side rails; and adjustable retaining means formaintaining said support bar at any of a multiplicity of differentpositions within said range to vary the points of contact between saiddressing tools and said abrading wheel grooves and thereby compensatefor wear on said dressing tools at incremental points therealong.

4. A dressing device as set forth in claim 1 and further comprising aguide bar disposed in parallel spaced relation to said support bar; adressing tool holder mounted in engagement with said support bar andsaid guide bar and movable therealong transversely of said abradingwheel; and a face dressing tool, mounted in said tool holder inadjustable fixed position with respect to said abrading Wheel, said facedressing tool having a grinding portion for dressing the face of saidabrading wheel as said tool holder is moved transversely thereof.

5. A dressing device as set forth in claim 1 and further comprising aguide bar disposed in parallel spaced relation to said support bar; adressing tool holder having a guide notch in one face thereof; means formounting said tool holder on said support bar and guide bar with saidguide bar engaged in said notch and with another face of said toolholder engaging said support bar; means comprising a lead screw formoving said dressing tool holder longitudinally of said guide andsupport bars; and a face dressing tool, mounted in said tool holder inadjustable fixed position With respect to said abrading wheel, said facedressing tool having a grinding portion for engaging and dressing theface of said abrading wheel as said tool holder is moved transverselythereof.

References Cited in the file of this patent UNITED STATES PATENTS

